käyttönimi
käyttönimi is a Finnish term that translates literally to “use name” in English, and is commonly used to refer to a user name, specifically the login identifier chosen by a person for accessing computer systems, online services, or other digital platforms. The term entered widespread usage in the 1990s with the expansion of the internet and the growth of individual accounts on websites, forums, and email services. In many Finnish-language interfaces, the label “käyttönimi” replaces English words such as “username” or “login name,” indicating the expected input for user authentication.
Design guidelines for a good käyttönimi vary across contexts but commonly stress uniqueness, privacy, and memorability.
In security contexts, the risk of password–username correlation is recognized. When attackers guess a commonly used
The Finnish word has been adopted into other languages in specialized contexts; for example, in the field